Both Uses

tartar
in
A Midsummer Night's Dream
(Auto-generated)

PUCK I go, I go; look how I go,—Swifter than arrow from the Tartar's bow.†
Scene 3.2 *
out, tawny Tartar, out!†
Scene 3.2

Definitions:

(1) (tartar as in: tartar on the teeth)
calcified deposits on the teeth, formed by the continuous presence of dental plaque (also called calculous)
(2) (meaning too common or too rare to warrant focus)
Do not confuse this with the proper noun, Tartar, which references a central Asian people once known for their ferocity in battle.

The expression tartar sauce refers to a mayonnaise-based sauce commonly served with seafood and sometimes spelled tartare sauce. You may also see steak tartar in reference to a ground beef dish that is eaten raw; though the preferred spelling of the dish is steak tartare.

Much more rarely, tartar can reference anyone with a bad temper, or it can reference a reddish crust or sediment in wine casks.